A portal can be secure while allowing password managers and paste. Before commissioning custom sign-in controls, define how customers can authenticate without an unnecessary memory or transcription task. Do not treat a paste-blocking script as evidence of security.
Primary evidence and claim boundaries
WCAG accessible-authentication guidance identifies password-manager support and copy/paste as ways to reduce cognitive burden, within the criterion’s stated alternatives and exceptions. Primary reference · Read 17 October 2026.
Filled acceptance example
Synthetic teaching scenario, not a client case, provider integration test or business result. Scroll the example table on narrow screens.
| Synthetic sign-in journey | Acceptance action | Expected outcome |
|---|---|---|
| Existing account; saved credentials | Password manager fills username/password | Fields accept input; normal validation runs |
| Standalone password manager | Paste password | No arbitrary paste rejection |
| One-time code message | Paste complete code | Supported code entry without forced manual retyping |
| Invalid credentials | Submit through assisted input | Honest error; no false authenticated state |
Practical handover procedure
- Ask the authentication supplier which native field purposes and supported assistance paths it provides. Include challenge alternatives and recovery access in the brief without inventing a universal CAPTCHA solution.
- Use dummy accounts to test autofill, paste, keyboard and the complete multi-step flow on the supported browser set. Do not record actual passwords or reusable codes in evidence.
- Check that assistance does not bypass normal validation or authorisation. Review focus, error feedback and re-entry after a failed attempt together with the security owner.
Interpret the outcome
The acceptance question is whether assistance works throughout authentication, not whether a form has an autocomplete attribute. A one-time-code UI that accepts paste into only its first of six boxes may need a different design. Test the complete outcome before approving a polished mockup.
Acceptance decision
Require successful assisted sign-in and correct failure handling without exposing secrets. Recovery-token lifecycle and tenant permissions remain separate tests.
Limits and unverified work
Synthetic journeys only; no real sign-in or credential entry performed. This does not certify an identity provider or weaken MFA, password, browser or security policies.
Download the filled bilingual acceptance record — Contains these inputs, steps, expectations and limits. This is a teaching record, not an executable integration.